Original scientific paper
https://doi.org/10.15255/CABEQ.2017.1196
Photooxidative Stability of Polyurethane/Polycarbonate Blends
E. Govorčin Bajsić
; Department of Polymer Engineering and Organic Chemical Technology, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10 000 Zagreb, Croatia
E. Zdraveva
; Department of Basic Natural and Technical Sciences, Faculty of Textile Technology, University of Zagreb, Prilaz baruna Filipovića 28a, 10 000 Zagreb, Croatia
Abstract
In this work the photooxidative stability of polyurethane/polycarbonate (PU/PC) blends was studied. Poly (ester–urethane) elastomers based on polycaprolactone glycol and an aromatic type of diisocyanate (MDI) were synthesized by a prepolymer procedure. Blends of PU and PC with different weight ratios were prepared using a Brabender mixer. Thermal and mechanical properties were evaluated after UV irradiation (200
hours) performing DSC, DMA, TGA and tensile tests. DMA results indicated partial miscibility of PC and PU in the PU/PC blends with higher hard segment content, attributed to favourable interactions between the ester groups from the soft segments and urethane groups from the hard segments. The photochemical degradation of the polyurethane is associated with the scission of the urethane group and photooxidation of the central CH2 group between the aromatic rings. The processes of photooxidative degradation are less pronounced in PU/PC blends with higher hard segment content in the polyurethane.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Keywords
polyurethane; polycarbonate; elastomers; polymer blends; UV irradiation
Hrčak ID:
203171
URI
Publication date:
5.7.2018.
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